That's based on a guy that just puts it out there on GitHub, doesn't have a side service based on his OSS stuff, doesn't offer support/commercial licenses, and so on...
But still, it's something else to say
"OSS doesn't make money" (which is controversial, if not wrong)
instead of:
"OSS doesn't make money if you don't have enough time to build the side services and market it because of lack of time meanwhile maintain[ing] a job"
(which most can agree with)